NCAR / manage_externals / 54

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travis-ci

Improve branch and tag error checking.

Introduction of remotes and tag checks didn't cover enough edge cases for
determining if something is a branch or tag, and didn't report helpful error
messages. Untracked remote branches were being reported as invalid refs rather
than valid branches that could be checkoud out.

Testing:
  python2/3 - make test - pass
  python2/3 - manual checkout, status - ok

493 of 598 branches covered (82.44%)

Branch coverage included in aggregate %.

1690 of 1908 relevant lines covered (88.57%)

2.2 hits per line